Metal ladder



Aug. `17' 1926.

F. L.. JACOBS 1mm. Limmen rigixial F110@ la! 8. 1922 lNv NToR L wn A'rroRNEY Aug.v 17, 1926.

UNUED STATES This invention relates to ladders and more L particularly relates to. ladders of metallic f construction.

It is the object of the invention to provide a metal ladder of very li ht yet strong con- ;Vstruetion, having a nove structural forma- J tion nand unionfbetween its rungs and the tie connections between the uprights or side .1; railsof the ladder. In attaining this object, vthe invention contemplates the use of Vmetal tubing to form both the rangs and side rails, an the provision of tie rods passing through certain of the rangs, and having headed extremities en ga 'ng in recesses formed by iridenting the sidgel rails, the bosses formed by the indentations bein utilized to support and reinforce the y entering the ends thereof. In the accompanying drawing,

1 is a front view of the improved ladder; Figure 2 is an enlarged longitudinal seci tion'of a portion of the ladder; y Figure 3 is a cross section ou a plane interseating one of the rungs.

In these viewsthe reference character 1 designates the uprights or side rails, and 2 the rungs ofthe ladder, said parts being formed of steel tubing, preferably seamless. It is" preferred to employ rungs of circular cross section and side rails of a cross section elongated transversely of the rungs. As shown, the front and rear faces of the side rails Iare rounded, while the inner'and outer faces thereof are flat. Thus the side rails v= i nt smooth continuous surfaces for enf n nt b the hands of. a person using the e rangs 2 are. passed snugly through openings 1n the inner walls of the side rails and abut interiorly against the t outer walls thereof. Through certain of said L rungs, for example alternate ones, tie rods 3 y "are p said rods having terminal heads f n one of which may be a nut, clamping against the outer 'faces of the side rails. It

PATENT OFFICE.

rnnnincnn noone, or rmwanx, new JERSEY.

nur. LADDER.

lo. 1,75,208, dated larok 2, 19%, Serial No. 559,258, ed Iay 8, 1922. Application for mime mea :une a, 192s. semi no. 113,505.

is undesirable to so expose said nuts that they may encounter the hands of a person using the ladder. The invention avoids such exposure by indenting the outer walls of the side rails 1n registration with such of the rungs as enclose tie rods, and locating the heads 4 within the indentatio-ns 5. Such location of said-heads not only avoids obstructing the exterior faces of the side rails but to some extent houses said heads within the side rails so as to afford some protection against moisture and consequent corrosion.

The interior bosses 6, which are produced by the indentations 5, are utilized to reinforce the extremities of the rungs, said bossesV being preferably proportioned to snugly fit into said extremities. Thus the load upon any of the rungs enclosing the tie rods is -distributed to both the inner and outer walls of the side rails.

The described location of the tie members within certain of the rungs is further advantageous in that concealment of the tie members is thus effected, so that the latter detract nothing from the appearance of the ladder. Also this location prevents improper use of the tie members as foot rests. It is a desirable feature of the described construction that it permits of a` very rapid and secure assembly of the parts and produces a comparatively light and strong ladder having a fiush and smooth exterior.

What I claim is:

In a ladder, a tubular side rail having oplposite wall portions with an opening in one of said portions and a boss in the other extending toward said opening and forming an indentation exteriorly of the rail, a tubular rung passing through said opening and contiguous to said boss, and a tie member extending within the rung and having an enlargement within said indentation.

Intestimony whereof, I have signed this specification.

FREDRICK L. JACOBS. 

